Polarized
lens technology is one of the most revolutionary applications of science and
optics that eliminates annoying glare and eye fatigue.
Basically,
Polarized eye candy for your eyes! After years of research and refinement, Polarized
was perfected by combining advanced polycarbonate technology and processes with
cutting edge coatings, turning conventional thinking on its head. Polar Polarized
ensures the complete and thorough elimination of glare, polarized light and harmful
UV rays and provides excellent eye protection. Its unique light absorption and
molecular properties enhance contrast and depth perception while maintaining
color integrity and minimizing eye strain.
Perceived benefits include realized visual acuity, enhanced sharpness, reduced glare and managed polarity. But don’t take our word for it, see for yourself.
Perceived benefits include realized visual acuity, enhanced sharpness, reduced glare and managed polarity. But don’t take our word for it, see for yourself.
Cutting-Edge Polarized Material
- Polycarbonate injected at extraordinary pressure to maximize optical clarity and visual acuity – eliminates eye fatigue and minimizes distortion.
- Unparalleled protection – Polarized Polycarbonate is rugged (up to 5 times more impact resistant than standard glass).
- Multi-layered polarizing film and patented processing technology – enhanced, distortion free vision and maximum polarized glare reduction.
- Lightweight performance – significantly lighter than glass (perfect for athletes and extended wear).
- 100% UV Protection, blocks 99.9% of polarized light.
- Polarized lenses are at the core of polarized platform and incorporate superior scratch resistant protection, ultimate impact resistance and ultra lightweight comfort.
A polarizer is an optical
filter that passes light of a specific polarization and blocks waves of other
polarizations. It can convert a beam of light of undefined or mixed
polarization into a beam with well-defined polarization. The common types of
polarizers are linear polarizers and circular polarizers. Polarizers are used in many
optical
techniques and instruments, and polarizing filters find applications in photography
and liquid crystal display technology.
Polarizers can also be made for other types of electromagnetic waves besides light, such as radio waves,
microwaves,
and X-rays.
Linear
polarizers
Linear polarizers can be divided into two general categories: absorptive
polarizers, where the unwanted polarization states are absorbed by the device, and beam-splitting
polarizers, where the unpolarized beam is split into two beams with
opposite polarization states
Wire-grid polarizer
A wire-grid polarizer converts an unpolarized beam into one
with a single linear polarization. Coloured arrows depict the electric field
vector. The diagonally-polarized waves also contribute to the transmitted
polarization. Their vertical components are transmitted, while the horizontal
components are absorbed and reflected. (This is not clearly shown.)
The simplest linear polarizer in concept is the wire-grid polarizer,
which consists of a regular array of fine parallel metallic wires, placed in a
plane perpendicular to the incident beam. Electromagnetic waves which have a
component of their electric fields aligned parallel to the wires induce
the movement of electrons
along the length of the wires. Since the electrons are free to move in this
direction, the polarizer behaves in a similar manner to the surface of a metal when reflecting
light; and the wave is reflected backwards along the incident beam (minus a
small amount of energy lost to joule
heating of the wire).[1]For waves with electric fields perpendicular to the wires, the electrons cannot move very far across the width of each wire; therefore, little energy is reflected, and the incident wave is able to pass through the grid. Since electric field components parallel to the wires are reflected, the transmitted wave has an electric field purely in the direction perpendicular to the wires, and is thus linearly polarized. Note that the polarization direction is perpendicular to the wires; the notion that waves "slip through" the gaps between the wires is incorrect.[2]
For practical use, the separation distance between the wires must be less than the wavelength of the radiation, and the wire width should be a small fraction of this distance. This means that wire-grid polarizers are generally only used for microwaves and for far- and mid-infrared light. Using advanced lithographic techniques, very tight pitch metallic grids can be made which polarize visible light. Since the degree of polarization depends little on wavelength and angle of incidence, they are used for broad-band applications such as projection.
Absorptive polarizers
Certain crystals, due to the effects described by crystal optics, show dichroism, preferential absorption of light which is polarized in particular directions. They can therefore be used as linear polarizers. The best known crystal of this type is tourmaline. However, this crystal is seldom used as a polarizer, since the dichroic effect is strongly wavelength dependent and the crystal appears coloured. Herapathite is also dichroic, and is not strongly coloured, but is difficult to grow in large crystals.A Polaroid polarizing filter functions similarly on an atomic scale to the wire-grid polarizer. It was originally made of microscopic herapathite crystals. Its current H-sheet form is made from polyvinyl alcohol (PVA) plastic with an iodine doping. Stretching of the sheet during manufacture causes the PVA chains to align in one particular direction. Valence electrons from the iodine dopant are able to move linearly along the polymer chains, but not transverse to them. So incident light polarized parallel to the chains is absorbed by the sheet; light polarized perpendicularly to the chains is transmitted. The durability and practicality of Polaroid makes it the most common type of polarizer in use, for example for sunglasses, photographic filters, and liquid crystal displays. It is also much cheaper than other types of polarizer.
A modern type of absorptive polarizer is made of elongated silver nanoparticles embedded in thin (≤0.5 mm) glass plates. These polarizers are more durable, and can polarize light much better than plastic Polaroid film, achieving polarization ratios as high as 100,000:1 and absorption of correctly-polarized light as low as 1.5%.[3] Such glass polarizers perform best for short-wavelength infrared light, and are widely used in optical fiber communications.
Beam-splitting polarizers
Beam-splitting polarizers split the incident beam into two beams of differing linear polarization. For an ideal polarizing beamsplitter these would be fully polarized, with orthogonal polarizations. For many common beam-splitting polarizers, however, only one of the two output beams is fully polarized. The other contains a mixture of polarization states.Unlike absorptive polarizers, beam splitting polarizers do not need to absorb and dissipate the energy of the rejected polarization state, and so they are more suitable for use with high intensity beams such as laser light. True polarizing beamsplitters are also useful where the two polarization components are to be analyzed or used simultaneously.
Polarization by reflection
A stack of plates at Brewster's angle to a beam reflects off
a fraction of the s-polarized light at each surface, leaving a p-polarized
beam. Full polarization at Brewster's angle requires many more plates than
shown. The arrows indicate the direction of the electrical field, not the
magnetic field, which is perpendicular to the electric field
When light reflects at an angle from an interface between two transparent
materials, the reflectivity is different for light polarized in the plane of incidence and light polarized
perpendicular to it. Light polarized in the plane is said to be p-polarized,
while that polarized perpendicular to it is s-polarized. At a special
angle known as Brewster's angle, no p-polarized light is
reflected from the surface, thus all reflected light must be s-polarized,
with an electric field perpendicular to the plane of incidence.A simple linear polarizer can be made by tilting a stack of glass plates at Brewster's angle to the beam. Some of the s-polarized light is reflected from each surface of each plate. For a stack of plates, each reflection depletes the incident beam of s-polarized light, leaving a greater fraction of p-polarized light in the transmitted beam at each stage. For visible light in air and typical glass, Brewster's angle is about 57°, and about 16% of the s-polarized light present in the beam is reflected for each air-to-glass or glass-to-air transition. It takes many plates to achieve even mediocre polarization of the transmitted beam with this approach. For a stack of 10 plates (20 reflections), about 3% (= (1-0.16)20) of the s-polarized light is transmitted. The reflected beam, while fully polarized, is spread out and may not be very useful.
A more useful polarized beam can be obtained by tilting the pile of plates at a steeper angle to the incident beam. Counterintuitively, using incident angles greater than Brewster's angle yields a higher degree of polarization of the transmitted beam, at the expense of decreased overall transmission. For angles of incidence steeper than 80° the polarization of the transmitted beam can approach 100% with as few as four plates, although the transmitted intensity is very low in this case.[4] Adding more plates and reducing the angle allows a better compromise between transmission and polarization to be achieved.
Birefringent polarizers
Other linear polarizers exploit the birefringent properties of crystals such as quartz and calcite. In these crystals, a beam of unpolarized light incident on their surface is split by refraction into two rays. Snell's law holds for one of these rays, the ordinary or o-ray, but not for the other, the extraordinary or e-ray. In general the two rays will be in different polarization states, though not in linear polarization states except for certain propagation directions relative to the crystal axis. The two rays also experience differing refractive indices in the crystal.
Thin film polarizers
Thin-film linear polarizers are glass substrates on which a special optical coating is applied. Interference effects in the film cause them to act as beam-splitting polarizers. The substrate for the film can either be a plate, which is inserted into the beam at a particular angle, or a wedge of glass that is cemented to a second wedge to form a cube with the film cutting diagonally across the center.Thin-film polarizers generally do not perform as well as Glan-type polarizers, but they are inexpensive and provide two beams that are about equally well polarized. The cube-type polarizers generally perform better than the plate polarizers. The former are easily confused with Glan-type birefringent polarizers.
The History of Polarized Sunglasses
People have realized the importance of keeping the sun
from your eyes for thousands of years. Primitive versions of sunglasses have
been found around the world.
People have realized the importance of keeping the sun from
your eyes for thousands of years. Primitive versions of sunglasses have been
found around the world. Most notably were the smoke tinted glasses worn by
Chinese judges in the 14th century. The reasons for wearing sunglasses,
however, have changed. Today, we now know that sun rays have UV and blue light
which can cause long-term and short-term eye problems. They include cataracts
and even forms of eye cancers.
Modern-day sunglasses were first created in the late 1920s by Sam Foster, who sold them in Atlantic City, New Jersey. They soon became popular among the general population, celebrities, and the military. In fact, the Army commissioned an optical firm to create special sunglasses for their Air Corps pilots to protect their vision while they were in the sky.
Polarized sunglasses were first made in the late 1930s by the Ray Ban company as an anti-glare aviator sunglass. The sunglasses were made in a specially designed shape to give the pilot’s optimal shade from the sun as previous designs allowed some light in when the pilot looked down at their instrument panel. The glasses were given to all pilots free as a part of their uniform. A year after they were made, the polarized sunglasses became available for purchase for the general public.
Polarization in sunglasses is a popular feature in sunglasses now. They are a predominating favorite among people who spend a lot of time around the water. The polarized lens reduces the glare from the reflecting light in the water. The polarization is applied to sunglasses in three different ways. The cheapest method is to have a film of polarized filtering applied to the outer coating of the sunglasses. The filter can also be placed between the lens’s layers. The most expensive and newest way is to combine the filter with the lens material. This process is done by adding the filter to the lens while it is still liquid. It delivers the highest visual quality.
Polarized sunglasses have now become the name of quality with specification it has but they had a history behind their popularity. The Roman emperor Nero watched gladiator flights with the help of emeralds. Chinese in 12 century used flat panels to protect their eyes. But now people use tined lens. This effort was made by James Avscough in mid 18 century.
Polarized sunglasses first introduced in 1936 by Edwin H. Land. He used to make patented Polaroid filter to make these sunglasses as an effective protective cover against harmful rays and light glare. He further explain his work with the rule of light passing through these lens in single plane and this make the sunglasses to eliminate the rays of glare from actual light rays. Normal sunglasses allow to pass light in many planes and they cannot minimize the glare effect of light on your eyes but only polarized sunglasses.
This was just beginning of the industry now know as polarized sunglasses industry. The best brands for these sunglasses are ray ban, Gucci, Prada .
Modern-day sunglasses were first created in the late 1920s by Sam Foster, who sold them in Atlantic City, New Jersey. They soon became popular among the general population, celebrities, and the military. In fact, the Army commissioned an optical firm to create special sunglasses for their Air Corps pilots to protect their vision while they were in the sky.
Polarized sunglasses were first made in the late 1930s by the Ray Ban company as an anti-glare aviator sunglass. The sunglasses were made in a specially designed shape to give the pilot’s optimal shade from the sun as previous designs allowed some light in when the pilot looked down at their instrument panel. The glasses were given to all pilots free as a part of their uniform. A year after they were made, the polarized sunglasses became available for purchase for the general public.
Polarization in sunglasses is a popular feature in sunglasses now. They are a predominating favorite among people who spend a lot of time around the water. The polarized lens reduces the glare from the reflecting light in the water. The polarization is applied to sunglasses in three different ways. The cheapest method is to have a film of polarized filtering applied to the outer coating of the sunglasses. The filter can also be placed between the lens’s layers. The most expensive and newest way is to combine the filter with the lens material. This process is done by adding the filter to the lens while it is still liquid. It delivers the highest visual quality.
Polarized sunglasses have now become the name of quality with specification it has but they had a history behind their popularity. The Roman emperor Nero watched gladiator flights with the help of emeralds. Chinese in 12 century used flat panels to protect their eyes. But now people use tined lens. This effort was made by James Avscough in mid 18 century.
Polarized sunglasses first introduced in 1936 by Edwin H. Land. He used to make patented Polaroid filter to make these sunglasses as an effective protective cover against harmful rays and light glare. He further explain his work with the rule of light passing through these lens in single plane and this make the sunglasses to eliminate the rays of glare from actual light rays. Normal sunglasses allow to pass light in many planes and they cannot minimize the glare effect of light on your eyes but only polarized sunglasses.
This was just beginning of the industry now know as polarized sunglasses industry. The best brands for these sunglasses are ray ban, Gucci, Prada .
Browse through our stellar collection of lenses and frames for women and you’ll see the oversized designer sunglasses that look deliciously different on the well-known celebrities that look for them as often as you do. after all, looking good in the sun isn’t just a matter of good skin tone or a fancy wardrobe. You need to accent your face with eyewear that compliments everything else well. this is why we carry a wide selection of the most popular styles from companies like bvlgari, giorgio armani, christian dior, tom ford, and many others.
These aren’t cheap copies of designer sunglasses either. What good is wearing a name-brand eyewear manufacturer if you aren’t wearing the real thing, the styles that are exclusively original, with all the premium elements including the familiar temple logo designs you see so often.
still, focus online creates value by working with these companies to find the best deals of sunglasses and eyewear within their outstanding collection of accessories. These are savings we pass on to you, so that you can enjoy a look that turns heads when you venture outdoors for a little fun in the sun. Designer sunglasses are something you shouldn’t have to worry about, and our endless choices help take some of the guesswork out of knowing whether you’re getting styles and materials you can trust. so, if you want to capture a look that’s hot for her, take the time to browse our best models and find one that speaks to you.
at focus online, we know guys look great in polarised sunglasses , and guys like to show off a quality pair of glasses that are hot for him when he’s outside in the sun. Sex appeal is an important component of men’s eyewear, because it reveals something about the character of the guy who’s wearing a particular pair of lenses, a particular style of frame.
Protecting your eyes from the harsh rays of sunlight is another consideration for anyone looking into polarised sunglasses. Spending time outside shouldn’t be hazardous to your health, and that’s why we only select brands and styles that adhere to some pretty high standards in terms of uv protection. Beyond the urge to look “cool,” the best brands’ sunglasses create a whole new look for you, one that usually matches your personality or a quality of your character that makes each pair uniquely your own. it’s like having a signature style that says, “this is who i am, and i’m proud of it.” that’s the feeling you connect with when you find a pair of polarised sunglasses that suits your style. With over 300 pieces of quality men’s eyewear to choose from, you won’t have trouble finding something you like. What’s more, we have the brands that men ask for most often, like carerra, persol, marc jacobs, oakley, and ray ban. Our men’s collection of polarised sunglasses cover a wide range of outdoor activities, and the quality of these original frames and lenses is beyond compare. see for yourself why focus online has become a trusted name in online eyewear over the last few years. Notice how well the colours and styles of each vendor’s product line blend in with today’s “hot for him” fashions. Our job is to help you create a look that shows the world who you really are, and our commitment to bringing you the latest styles and widest selection makes that job easier for you, the customer.
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Why have we chosen ray ban sunglasses as part of our growing collection of designer lenses for women? it’s not hard to understand, once you know the facts. ray ban is one of the most respected names in performance-
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